Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China.
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| Title: | Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China. |
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| Authors: | Qiao, Yuheng1, Cui, Linhao1, Xing, Guangyuan1, Fu, Dongjing1, Chang, Chao1, Gaines, Robert2, Zhang, Xingliang1 xzhang69@nwu.edu.cn |
| Source: | Journal of Earth Science. Aug2024, Vol. 35 Issue 4, p1215-1223. 9p. |
| Subject Terms: | *Ediacaran fossils, *Surface of the earth, *Biological evolution, *Carbon-based materials, *Fossils, *Biotic communities |
| Abstract: | Burgess Shale-type deposits provide a wealth of information on the early evolution of animals. Questions that are central to understanding the exceptional preservation of these biotas and the paleoenvironments they inhabited may be obscured by the post-depositional alteration due to metamorphism at depth and weathering near the Earth's surface. Among over 50 Cambrian BST biotas, the Chengjiang and Qingjiang deposits are well known for their richness of soft-bodied taxa, fidelity of preservation, and Early Cambrian Age. While alteration via weathering has been well-investigated, the thermal maturity of the units bearing the two biotas has not yet been elucidated. Here we investigate peak metamorphic temperatures of the two deposits using two independent methods. Paleogeotemperature gradient analyses demonstrate that the most fossiliferous sections of the Chengjiang were buried at a maximum depth of ∼8 500 m in the Early Triassic, corresponding to ∼300 °C, while the type area of the Qingjiang biota was buried at a maximum depth of ∼8 700 m in the Early Jurassic, corresponding to ∼240 °C. Raman geothermometer analyses of fossil carbonaceous material demonstrate that peak temperatures varied across localities with different burial depth. The two productive sections of the Chengjiang biota were thermally altered at a peak temperature of approximately 300 °C, and the main locality of the Qingjiang biota experienced a peak temperature of 238 ± 22 °C. These results from two independent methods are concordant. Among BST deposits for which thermal maturity has been documented, the Qingjiang biota is the least thermally mature, and therefore holds promise for enriching our understanding of BST deposits. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 179038948 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Qiao%2C+Yuheng%22">Qiao, Yuheng</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cui%2C+Linhao%22">Cui, Linhao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Xing%2C+Guangyuan%22">Xing, Guangyuan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Fu%2C+Dongjing%22">Fu, Dongjing</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chang%2C+Chao%22">Chang, Chao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gaines%2C+Robert%22">Gaines, Robert</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Xingliang%22">Zhang, Xingliang</searchLink><relatesTo>1</relatesTo><i> xzhang69@nwu.edu.cn</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Earth+Science%22">Journal of Earth Science</searchLink>. Aug2024, Vol. 35 Issue 4, p1215-1223. 9p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Ediacaran+fossils%22">Ediacaran fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Surface+of+the+earth%22">Surface of the earth</searchLink><br />*<searchLink fieldCode="DE" term="%22Biological+evolution%22">Biological evolution</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon-based+materials%22">Carbon-based materials</searchLink><br />*<searchLink fieldCode="DE" term="%22Fossils%22">Fossils</searchLink><br />*<searchLink fieldCode="DE" term="%22Biotic+communities%22">Biotic communities</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Burgess Shale-type deposits provide a wealth of information on the early evolution of animals. Questions that are central to understanding the exceptional preservation of these biotas and the paleoenvironments they inhabited may be obscured by the post-depositional alteration due to metamorphism at depth and weathering near the Earth's surface. Among over 50 Cambrian BST biotas, the Chengjiang and Qingjiang deposits are well known for their richness of soft-bodied taxa, fidelity of preservation, and Early Cambrian Age. While alteration via weathering has been well-investigated, the thermal maturity of the units bearing the two biotas has not yet been elucidated. Here we investigate peak metamorphic temperatures of the two deposits using two independent methods. Paleogeotemperature gradient analyses demonstrate that the most fossiliferous sections of the Chengjiang were buried at a maximum depth of ∼8 500 m in the Early Triassic, corresponding to ∼300 °C, while the type area of the Qingjiang biota was buried at a maximum depth of ∼8 700 m in the Early Jurassic, corresponding to ∼240 °C. Raman geothermometer analyses of fossil carbonaceous material demonstrate that peak temperatures varied across localities with different burial depth. The two productive sections of the Chengjiang biota were thermally altered at a peak temperature of approximately 300 °C, and the main locality of the Qingjiang biota experienced a peak temperature of 238 ± 22 °C. These results from two independent methods are concordant. Among BST deposits for which thermal maturity has been documented, the Qingjiang biota is the least thermally mature, and therefore holds promise for enriching our understanding of BST deposits. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12583-023-1921-2 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1215 Subjects: – SubjectFull: Ediacaran fossils Type: general – SubjectFull: Surface of the earth Type: general – SubjectFull: Biological evolution Type: general – SubjectFull: Carbon-based materials Type: general – SubjectFull: Fossils Type: general – SubjectFull: Biotic communities Type: general Titles: – TitleFull: Thermal History of Cambrian Burgess Shale-Type Deposits: New Insights from the Early Cambrian Chengjiang and Qingjiang Fossils of South China. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Qiao, Yuheng – PersonEntity: Name: NameFull: Cui, Linhao – PersonEntity: Name: NameFull: Xing, Guangyuan – PersonEntity: Name: NameFull: Fu, Dongjing – PersonEntity: Name: NameFull: Chang, Chao – PersonEntity: Name: NameFull: Gaines, Robert – PersonEntity: Name: NameFull: Zhang, Xingliang IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 1674487X Numbering: – Type: volume Value: 35 – Type: issue Value: 4 Titles: – TitleFull: Journal of Earth Science Type: main |
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